东海高温深井钻井液技术

High-temperature deep well drilling fluid technology in the East China Sea

高温深井水基钻井液性能优化对于提高东海区域深井、超深井及大位移井钻井时效、降低综合成本具有重要意义。通过采用微纳米封堵、活度调控提升井壁稳定性,优选高效润滑剂提高钻井液润滑性能,研发高温护胶剂提高钻井液护胶性能,构建了东海新型高温深井水基钻井液体系。实验结果表明:新型高温深井水基钻井液体系膜效率提升31.6%,水迁移驱动力可调至小于等于零,扭矩降低率91.6%,高温老化后动切力可达10 Pa。现场应用结果表明:新型高温深井水基钻井液体系高温滤失量小、体系性能稳定,应用井井径规则、摩阻扭矩小、作业顺利、钻井时效提高。本文研究的新型高温深井水基钻井液体系已在东海深井钻井中取得成功应用,可为类似高温深井、大位移井安全高效钻井提供借鉴。

The performance optimization of high-temperature deep well water-based drilling fluid is of great significance for improving drilling time-efficiency and reducing comprehensive cost of deep wells,ultra-deep wells and extended reach wells in the East China Sea.By using micro-nano sealing and activity control to improve the borehole stability,selecting efficient lubricants to improve the lubrication performance of drilling fluid,and developing high-temperature colloid protecting agent to improve the colloid protecting performance of drilling fluid,a new high-temperature deep well water-based drilling fluid system in the East China Sea was constructed.The experimental results show that the membrane efficiency of the new high-temperature deep well water-based drilling fluid system is increased by 31.6%,the driving force of water migration can be adjusted to less than or equal to zero,the torque reduction rate is 91.6%,and the dynamic shear force can reach 10Pa after high temperature aging.The field application results show that it has the advantages of low high-temperature filtration loss,stable system performance,applicability for regular borehole diameter,low frictional torque,smooth operation and improved drilling time-efficiency.The system studied in this paper has been successfully applied in the deep well drilling of the East China Sea,and can provide reference for the safe and efficient drilling of similar high-temperature deep wells and extended reach wells.